US20060180143A1 - Aerosol dispensing device and method - Google Patents

Aerosol dispensing device and method Download PDF

Info

Publication number
US20060180143A1
US20060180143A1 US11/351,832 US35183206A US2006180143A1 US 20060180143 A1 US20060180143 A1 US 20060180143A1 US 35183206 A US35183206 A US 35183206A US 2006180143 A1 US2006180143 A1 US 2006180143A1
Authority
US
United States
Prior art keywords
liquid
capillary
ehd
comminution site
electrical potential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US11/351,832
Other versions
US7798420B2 (en
Inventor
James Lind
Beverly Piatt
James Dvorsky
Brian Graham
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EFILED INNOVATIONS LLC
Original Assignee
Battelle Memorial Institute Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Battelle Memorial Institute Inc filed Critical Battelle Memorial Institute Inc
Priority to US11/351,832 priority Critical patent/US7798420B2/en
Assigned to BATTELLE MEMORIAL INSTITUTE reassignment BATTELLE MEMORIAL INSTITUTE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DVORSKY, JAMES E., GRAHAM, BRIAN, LIND, JAMES J., PIATT, BEVERLY A.
Publication of US20060180143A1 publication Critical patent/US20060180143A1/en
Priority to US12/859,867 priority patent/US8141795B2/en
Application granted granted Critical
Publication of US7798420B2 publication Critical patent/US7798420B2/en
Assigned to EFILED INNOVATIONS, LLC reassignment EFILED INNOVATIONS, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BATTELLE MEMORIAL INSTITUTE
Assigned to EFIELD INNOVATIONS, LLC reassignment EFIELD INNOVATIONS, LLC CORRECTIVE ASSIGNMENT TO CORRECT THE NAME OF THE ASSIGNEE FROM EFILED INNOVATIONS, LLC TO EFIELD INNOVATIONS, LLC PREVIOUSLY RECORDED ON REEL 029666 FRAME 0544. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: BATTELLE MEMORIAL INSTITUTE
Expired - Fee Related legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M15/00Inhalators
    • A61M15/02Inhalators with activated or ionised fluids, e.g. electrohydrodynamic [EHD] or electrostatic devices; Ozone-inhalators with radioactive tagged particles
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M11/00Sprayers or atomisers specially adapted for therapeutic purposes
    • A61M11/001Particle size control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/0255Discharge apparatus, e.g. electrostatic spray guns spraying and depositing by electrostatic forces only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16Arrangements for supplying liquids or other fluent material
    • B05B5/1691Apparatus to be carried on or by a person or with a container fixed to the discharge device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053Arrangements for supplying power, e.g. charging power
    • B05B5/0533Electrodes specially adapted therefor; Arrangements of electrodes

Definitions

  • This invention relates to a device and method for dispensing aerosol sprays in a manner which promotes rapid and consistent vaporization.
  • the invention relates to dispensing aromas.
  • Aromas or olfactory stimulants there are various known techniques for dispensing or dispersing aromas or olfactory stimulants.
  • aromatic oils are often dispersed by application of heat to an evaporation surface. The heat may, however, detrimentally affect the aroma being dispensed.
  • the aroma dispensing device comprises an aromatic candle
  • the vapors carrying the aroma are often denatured or oxidized in the candle flame, reducing the intrinsic or “natural” quality of the fragrance.
  • Other aroma dispensing devices rely on the use of propellants or aerosols to enable the dispersion. However, such propellants and aerosols may also detrimentally affect the aroma being dispersed.
  • U.S. Pat. No. 5,196,171 to Peltier describes the generation of vapors and/or aerosols by applying a DC voltage to a wick-like, porous emitter.
  • the wick comprises a porous “capillament assembly” in which is disposed a central conductive electrode.
  • the liquid provides a means of conducting the charge from the center of the wick to the outer surface where vaporization takes place due to corona discharge. The greatest concentration of vapors is created at the corners and edges (points or sharp radius edges) where the corona discharge forms.
  • Aerosols may also be created by the application of electrohydrodynamic (“EHD”) forces to a liquid.
  • EHD electrohydrodynamic
  • the liquid forms a so-called Taylor cone at the EHD comminution site, becomes charged, and forms a jet or ligament which separates, or comminutes, into an aerosol.
  • EHD electrohydrodynamic
  • U.S. Pat. No. 5,337,963 to Noakes describes a spraying device which comprises a vertically-disposed capillary tube with one end immersed in a fragrance-producing oil.
  • the high voltage is applied to the bulk liquid, generally near the submerged end of the wick.
  • U.S. Pat. No. 5,810,265 to Cornelius et al. describes yet another similar spraying device, but which capillary structure comprises a hollow capillary tube having a convoluted inner surface to enhance capillary action.
  • the high voltage is applied to the bulk liquid, also generally near the submerged end of the capillary tube.
  • U.S. Pat. No. 5,655,517 to Coffee describes a device for dispensing a comminuted liquid comprising a comminution site provided by fibers formed into a bundle projecting from an end surface or edge.
  • EHD spraying offers many advantages, including the ability to produce consistent sprays of aerosol particles having a narrowly-tailored size distribution, significant inconsistencies were observed in the delivery rate of the liquid to the surrounding air.
  • an object of the present invention to provide an aerosol delivery device that avoids or at least reduces adverse effects on an aroma resulting from the manner in which the aroma is delivered. It is another object of the present invention to provide an aerosol delivery device that enables improved control of delivery rate of the aerosol. It is yet another object of the invention to provide an aerosol delivery device that offers consistent aerosol delivery over the reservoir volume. It is a further object of the present invention to provide a method that offers the advantages of reduced adverse effects on the aroma, consistent aerosol delivery of the aroma, and improved capability for rapid vaporization.
  • these include, for example, anti-microbial agents; insect repellants; attractants; sterilizers; confusants; pheromones; fumigants; odor neutralizers; therapeutic agents, such as menthol and eucalyptus; animal mood control agents; household cleaning products, such as surface cleaning agents, surface modification agents for aesthetic benefits, surface protection agents, and sanitization/disinfectant agents; household laundry care products, such as stain-removing agents, fabric fresheners, and other fabric treatment agents for aesthetic benefits; personal cosmetic care products for body cleaning, body lotion, and sunscreen products for humans; and consumer adhesives.
  • Formulations, especially for aromas are oil-based, but other carriers may be used such as water, polymers, or organic solvents.
  • the present invention provides a method of using EHD to create a spray having a generally-consistent flowrate, preferably an aerosol spray that rapidly vaporizes; wherein capillary action wicks a liquid from a liquid source to an EHD comminution site; a first electrical potential, preferably a high-voltage potential, is applied to a location away from the liquid source and near the EHD comminution site, preferably in or near a tapered portion of a capillary element; a second electrical potential, preferably a ground, is applied to a location external to the EHD comminution site, preferably to enhance the spray without directing the spray.
  • a first electrical potential preferably a high-voltage potential
  • the present invention provides a method of using EHD to create a spray, preferably an aerosol spray, wherein the spray is controllably emitted intermittently at a generally-consistent flowrate.
  • the present invention provides a method of using EHD to maintain a desired/perceived level of fragrance over an extended period of time (e.g., weeks or months).
  • the present invention provides a method of using EHD to create a spray, preferably an aerosol spray, by providing a length of capillary wick having a first and second segments contiguous at a first location, the second segment including at least one EHD comminution site; contacting the capillary wick first segment with a liquid source at a second location spaced from the first location; applying a first electrical potential to the capillary wick at the first location; positioning a reference electrode, preferably a ground, external to the capillary wick; and electrohydrodynamically producing a spray, preferably an aerosol spray, from the at least one EHD comminution site at a generally-consistent flowrate.
  • the present invention provides an EHD apparatus for creating a generally-consistent flowrate spray, preferably an aerosol spray, comprising a reservoir for containing a source of EHD-comminutable liquid; a capillary element, preferably a capillary wick, comprising an EHD comminution site, positioned to contact the liquid source; a first charge source, preferably a high-voltage electrode, positioned in a spaced-apart relation to the liquid source and operably proximate the EHD comminution site; and a second charge source, preferably a ground, positioned external to the EHD comminution site.
  • a first charge source preferably a high-voltage electrode
  • the present invention provides an EHD apparatus for creating a generally-consistent flowrate spray, preferably an aerosol spray, comprising a first charge source, preferably a high-voltage electrode, positioned in contact with the capillary element.
  • the present invention provides an EHD apparatus for creating two or more generally-consistent flowrate sprays, preferably aerosol sprays, comprising two or more optionally curvilinear capillary wicks in liquid contact with two or more sources of EHD-comminutable liquid.
  • the present invention provides an EHD apparatus for creating a generally-consistent flowrate spray, preferably an aerosol spray, comprising a housing formed to include an aperture, the aperture formed to include a charge source; a source of EHD-comminutable liquid; a capillary wick, comprising an EHD comminution site, the capillary wick at least partially within the aperture, the EHD site external to the housing, and the capillary wick in liquid communication with the liquid source; and a ground operably proximate the EHD comminution site.
  • FIG. 1 is a schematic cutaway of an embodiment of the present invention and illustrating its components.
  • FIG. 2 is a partial detailed schematic cutaway of the embodiment of the present invention shown in FIG. 1 .
  • FIGS. 3 a - 3 h are schematic cutaways of various capillary means with associated electrodes according to further embodiments of the present invention.
  • FIG. 4 is a schematic cutaway of an embodiment of the present invention illustrating optional curvilinear capillary elements and an optional offset reservoir.
  • FIG. 5 is a schematic cutaway of an embodiment of the present invention illustrating a spray device comprising a taper-like candle configuration and showing a narrow and deep liquid reservoir.
  • EHD comminution entails the use of high voltages to charge liquids so that the electric charge on the liquid overcomes the surface tension of the liquid and the liquid is broken up, or comminuted, into a spray of fine aerosol droplets. In doing so, droplet size and droplet size distribution may be closely controlled. Droplet size may be in the sub-micron range, thus enabling rapid vaporization of the aromatics without denaturing and effecting a rapid onset of a perceived fragrance. Turning to FIGS. 1 and 2 , to induce this action, the liquid must experience a high electric field, but preferably only at the point of comminution, known as the spray site, or EHD comminution site 35 .
  • the bulk liquid 29 in the reservoir 32 may be charged and the charge is conducted through the liquid to the EHD comminution site 35 at the tip of the delivery column 34 .
  • an opposing electrode often referred to as a reference or inducing electrode, and often a ground 26 , is spaced away from the spray site 35 to help generate a well-defined field.
  • the liquid exhibits relatively high resistivity, such as with many aroma oils, or is semi-conductive, it is possible to induce a potential differential across the liquid itself if sufficiently high voltage is applied between the reservoir 32 and the reference electrode 26 and electric current flows through the highly-resistive liquid. As this happens, however, undesirably high levels of electric field pumping may occur.
  • the first is the capillary action associated with the liquid interaction (liquid surface tension, dynes/cm) with the surface energy of the capillary means (dynes/cm).
  • the second is the electric field pumping due to the high voltage imposed on the liquid to induce aerosolization. It has been found that when a high-voltage charge sufficient to induce EHD spraying is applied to the bulk liquid, even near the capillary inlet for aroma and aerosol generation, a high degree of liquid delivery variability results at the EHD spray site at the opposite end of the capillary.
  • high-voltage pumping may contribute to the mechanism of liquid movement in the capillary at voltages necessary for EHD spraying, and that the voltage gradient along the capillary results in inconsistent movement through the capillary voids, particularly when fluid levels' in a supply reservoir change over time.
  • the dispensing device 10 generally comprises a housing 12 ; a liquid source 29 , preferably contained within a reservoir 32 ; a voltage source, generally an electrode 31 ; a capillary element 34 terminating in an EHD comminution site 35 , generally, a capillary element with an associated electrode 31 ; and a reference electrode, or ground 26 , 27 .
  • the dispensing device 10 may comprise a removable cap 14 that allows access to the internal components of the device 10 , a base 16 to further contain the internal components and to provide a stable platform for the device 10 when placed upon a horizontal surface, a battery 18 , a high-voltage power supply 22 to convert voltage (e.g., 9V) from the battery 18 to the higher, kV-level voltage required for operation of the device 10 , a circuit board 20 to handle the electronics functions such as timing, voltage control, operational indicators (e.g., lights, and control of intensity and delivery rate), a high-voltage lead 30 running between the output of the high-voltage power supply 22 and the electrode 31 , and a switch 24 to control operation of the device 10 .
  • a removable cap 14 that allows access to the internal components of the device 10
  • a base 16 to further contain the internal components and to provide a stable platform for the device 10 when placed upon a horizontal surface
  • a battery 18 to further contain the internal components and to provide a stable platform for the device 10 when placed
  • the optional light may optionally contribute to a burning candle-like appearance for the device 10 or may be used to illuminate the spray, evoking a fountain-like effect.
  • the device may also comprise various control features to allow a user to adjust the spray and timing of the device.
  • liquid is supplied to the delivery column 34 , 64 (e.g., FIG. 3 c ) from the liquid source 29 .
  • the delivery column 34 , 64 generally comprises a capillary element 46 , 66 ( FIG. 3 ) which may be formed from a capillary tube 46 ( FIG. 3 a ) or a wick 66 ( FIG. 3 c ) which will enable the liquid to be drawn toward the EHD comminution site tip 35 where a voltage charge causes the liquid to EHD comminute into an aerosol.
  • placement of the electrode 31 , 68 is important to providing consistent liquid and aerosol delivery rates. Capillary action has been shown to be an effective method for moving liquid from the reservoir 32 to the EHD comminution site 35 .
  • capillary elements are possible.
  • the important attribute is the ability to deliver the liquid from the liquid source 29 to the EHD comminution site 35 .
  • the rate of capillary delivery must be sufficient to at least match the rate of EHD comminution or the EHD comminution site 35 will be starved of liquid and aerosolization will cease, or at a minimum aerosolization oscillates as liquid partially replenishes the EHD comminution site 35 and is sprayed away.
  • Capillary tubes 46 FIG. 3 a
  • capillary tubes 46 filled with a porous material 56 FIG. 3 b
  • fiber-like wicks 66 FIGS. 3 c - 3 h
  • Tubing materials include ABS, rigid PVC, polyester, polyamide, glass, Teflon® (poly-tetrafluoroethylene), PEEK, and polyimide.
  • an acceptable adhesion to the tube occurs when the surface energy of the polymer is greater than the surface tension of the liquid, preferably about 8-10 dynes/cm or more greater than the surface tension of the liquid.
  • preferred materials would include (with representative surface energy values) ABS (35-42 dynes/cm), rigid PVC (39 dynes/cm), polyester (41-44 dynes/cm), polyamide (ca.
  • the capillary tube 46 need not be a single element. Multiple tubes and multiple tubes clustered together may be used.
  • the capillary tube 46 need not be limited to a cylinder with a single opening. For example, two or more tubes may be coaxially combined to create a central aperture along with one or more annular apertures.
  • wicks include plotter pen wicks, felt nibs, china bristles, twisted nylon twine, braided shoelaces, foam materials, and candle wicks. Materials may be polymeric, such as polyester, or natural, such as cotton.
  • the porous wicking material has an open cell structure with a porosity of about 40 percent.
  • the voids have consistent size and shape and the wicks exhibit uniformity from one wick to another.
  • each wick has a well-defined tapered, conical tip that is consistent from wick to wick.
  • each conical tip has a low height-to-diameter aspect ratio, but high enough to provide an effective EHD comminution site 35 .
  • capillary elements or wicks may be configured with multiple reservoirs (not shown) within the same dispensing device.
  • the capillary elements 166 may have curvilinear shapes to allow for placement of the spray sites, and positioning of the reservoir(s) 132 and other internal operational elements as required for a particular application.
  • the size and shape of the other elements or desired placement of replaceable reservoirs may dictate non-symmetrical apparatus designs, irregularly-shaped reservoirs 132 , and curvilinear capillary elements 166 .
  • There may be multiple spray sites drawing from a single reservoir. Where there are multiple reservoirs (not shown), multiple liquids may be sprayed either simultaneously or in a timed sequence. This latter capability enables the ability to dispense a first aroma and then cycle through separate aromas, thereby providing a continuous level of perceived fragrances and avoiding the phenomenon of olfactory saturation.
  • a key element in the present invention is the placement of the electrode 48 , 68 relative to the capillary element 46 , 66 , specifically relative to the EHD comminution site 35 .
  • the electrode 48 , 68 is placed in the bulk liquid in the reservoir 32 , even if placed near the bulk liquid end of the capillary element 46 , 66 in the liquid, high voltages are required to effect aerosolization at the EHD comminution site 35 , especially with liquids having high resistivities, with resultant high levels of electric field pumping which produce inconsistent delivery rates.
  • the capillary element 46 , 66 acts as a resistive element to the electric potential between the electrode 68 ′ ( FIG. 3 c ) and the EHD comminution site 35 at the end of the capillary element 46 , 66 .
  • a longer path effects a higher resistance and voltage drop which leads to the need for a higher electric potential and a less-consistent flowrate of aerosol.
  • the resistance and voltage drop decrease, the required voltage decreases, and a more-consistent flowrate of aerosol results.
  • the present invention limits electric field pumping to a smaller length of the capillary element 46 , 66 .
  • the electrode 48 , 68 , 78 , 88 , 88 ′, 98 , 98 ′, 108 does not extend beyond the EHD comminution site 35 ; some material of the capillary element covers or extends beyond the electrode. This is where the liquid gathers via capillary action to be available to the high-voltage charge to aerosolize it.
  • the present invention improves delivery rates, allowing for consistent, repeatable delivery rates over time. In the field of aroma delivery, for example, this may be very desirable.
  • the main factors in placing the electrode 68 to reduce or eliminate electric field pumping is proximity to the spray tip 35 and sharpness of the tip 35 . Minor factors include liquid resistivity, capillary uptake, aerosolization rate, and position of the ground 26 .
  • the electrode 68 must be placed operably, or effectively, proximate the EHD comminution site 35 . That is, the position of the electrode 68 relative to the EHD comminution site 35 must be adjusted to produce a consistent aerosol delivery rate given the properties noted above. Not only may consistent delivery rates be achieved during each “on” cycle (discussed below), consistent delivery rates may be achieved over extended periods of “on” and “off” cycles.
  • the percent C v was calculated by dividing the standard deviation by the mean. This measurement allows for comparing equally various wicks and configurations. The lower the C v , the more consistent the flowrate.
  • the percent C v improved was reduced (was reduced) in the range of three to 15 percentage points. For example, one wick improved from 28.7 percent C v to 19.3 percent C v .
  • the preferred percent C v is less than 20, more preferably less than ten. Much below ten percent is barely discernable by the average human olfactory senses.
  • the position of the charge electrode 68 has been found to be within the conical portion of the spray tip.
  • the position of the charge source 68 has been in the range of 0.020 inches to 0.250 inches from the comminution site 35 to the charge point 68 .
  • the measurement for a conducting wick would be virtually zero.
  • FIG. 3 shows a basic capillary element 44 comprising a capillary tube 46 with a voltage source electrode 48 positioned within the tube 46 .
  • FIG. 3 b shows a similar arrangement, but with a porous material 56 disposed within the capillary tube 46 . Operation of the capillary element 54 shown in FIG. 3 b is similar to that of the capillary element 44 shown in FIG. 3 a . As shown in FIG. 3 c , a capillary element 64 may comprise a porous wick 66 into which is inserted a voltage source electrode 68 . The embodiment shown in FIG.
  • 3 c provides a voltage source 68 inserted into the wick 66 near the EHD comminution site 35 .
  • the electric field pumping is controlled and consistent aerosol delivery results.
  • the voltage source electrode 68 it is possible, in some embodiments, to have small amounts of undesirable electric field pumping downward and counter to the upward capillary action flow. This may be countered by positioning an additional voltage source electrode 68 ′ as shown.
  • the electrical potential across the wick 66 may be equalized, or nearly so, and there is little or no counter electric field pumping.
  • FIG. 3 d yet another embodiment of a capillary element 74 is shown.
  • a voltage source electrode 78 comprises a helical coil positioned coaxial with the porous wick 66 . As long as the voltage source electrode 78 is positioned operably proximate the porous' wick 66 , whereby a sufficient charge is imposed on the liquid, electric field pumping is controlled, and consistent aerosol delivery results. Counter electric field pumping is also minimized or eliminated.
  • FIGS. 3 e - 3 h illustrate yet other embodiments of the capillary element 84 , 94 , 104 , 114 of the present invention.
  • the voltage source electrode 88 , 98 , 108 , 118 may comprise a sheath surrounding the porous wick 66 as shown or, alternatively, the voltage source electrode may comprise arcuate tabs or the like (not shown) which may be positioned operably proximate the porous wick.
  • FIGS. 3 g and 3 h illustrate an embodiment wherein a portion of the housing 12 or reservoir cover 33 is formed to include the voltage source electrode 108 , 118 .
  • Plastic materials of construction for such voltage source electrodes 108 , 118 include anti-static (E9-E12), static dissipative (E6-E9), and conductive plastics (E3-E6).
  • FIGS. 1 and 2 show an example of the placement of the ground 26 . If the ground 26 is placed too far from the EHD comminution site 35 , the charge at the site 35 does not “see” the ground 25 and its effects are not noticeable. If the ground 26 is placed too close to the EHD comminution site 35 , the aerosol spray may be misdirected toward the ground 26 . Preferably, the ground 26 is placed to generate an electric field required to produce an aerosol without causing the spray to be attracted to the ground 26 .
  • the optimal position of the ground 26 will depend upon the particular configuration of the device 10 .
  • the liquid properties, particle size, spray site geometry, and corresponding electric field potential needed may affect the placement of the ground 26 .
  • the ground 26 is positioned off to the side and near the top of the delivery module 28 or just below the capillary element 34 .
  • the ground 26 may be a neutral or opposite charge to the aerosol particles spraying from the EHD comminution site.
  • the electrode 26 may be disposed closer to the site 35 to purposely direct the aerosol spray.
  • the ground 26 may comprise an adjustment (not shown) to allow varying of the position of the ground 26 .
  • the materials used for the ground 26 may be any conductor, including, but not limited to, metals and plastics.
  • the aerosol produced is preferably charged, but may be discharged and dispersed as neutral particles for selected applications.
  • an external ground reference electrode 26 may be utilized.
  • an object or an animal, human or otherwise may provide the ground reference.
  • various timing and control mechanisms are included as elements on the circuit board 20 or elsewhere.
  • the device 10 When the device 10 is initially activated in a room to emit an aroma(s), for example, it may be desirable to introduce a quantity of aroma sufficient to provide scent to the entire room after which the device 10 would shut off. Later, it may be desirable to periodically introduce a “maintenance” amount of scent to keep the level in the room constant and to counter the tendency of aromas to deaden or desensitize the sense of smell over time. This could be done by timing short sprays of perhaps several seconds duration with longer periods of quiescence. Such timing could also be used with multiple sprays having the same or different formulations. Depending upon the strength of the aroma, longer “on” times, upwards of one minute or more, may produce “hot spots” where the fragrance may become overwhelming. In these situations, the “off” time may be a minute or more.
  • fragrances that are related to each other may collectively produce a “bouquet” effect.
  • one fragrance may induce an invigorating effect (morning), a calming, or stress-relieving effect (midday), and yet another, a relaxing effect (evening).
  • the device 10 may maintain a constant delivery rate even if fluid flow rate declines over time.
  • the delivery rate may be maintained through shorter spray intervals within a spray cycle time.
  • a spray “on” interval may increase from, for example, five seconds to greater than five seconds.
  • the “off” time interval may decrease from, for example, 45 seconds to less than 45 seconds.

Abstract

A method for delivering an aerosol, especially an aromatic aerosol, comprising the steps of contacting a capillary wick, comprising an EHD comminution site, with a liquid source, whereby at least a portion of the liquid transports to the EHD comminution site; applying a voltage to the liquid within the capillary wick at a location spaced apart from the liquid source and proximate the EHD comminution site; and applying a ground reference at a location external to the EHD comminution site, wherein at least a portion of the liquid EHD comminutes to form a spray having a generally-consistent flowrate and a device therefor.

Description

    CROSS-REFERENCE TO RELATED APPLICATION(S)
  • This application claims priority to the following US Provisionals: “High Voltage Apparatus for Aerosol Delivery”, 60/652,059; “Apparatus for Aerosol Delivery Using Capillary Pumping from a Reservoir”, 60/652,060; “Apparatus for Aerosol Delivery Using Capillary Pumping”, 60/652,064; “Capillary Tip Geometries”, 60/652,057; and “Capillary Wick Aerosol Candle”, 60/652,067, the contents of each of which are fully incorporated herein.
  • STATEMENT REGARDING FEDERALLY-SPONSORED RESEARCH OR DEVELOPMENT
  • Not applicable.
  • INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A CD
  • Not applicable.
  • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • This invention relates to a device and method for dispensing aerosol sprays in a manner which promotes rapid and consistent vaporization. In particular, the invention relates to dispensing aromas.
  • 2. Background
  • There are various known techniques for dispensing or dispersing aromas or olfactory stimulants. For example, aromatic oils are often dispersed by application of heat to an evaporation surface. The heat may, however, detrimentally affect the aroma being dispensed. As well, where the aroma dispensing device comprises an aromatic candle, the vapors carrying the aroma are often denatured or oxidized in the candle flame, reducing the intrinsic or “natural” quality of the fragrance. Other aroma dispensing devices rely on the use of propellants or aerosols to enable the dispersion. However, such propellants and aerosols may also detrimentally affect the aroma being dispersed.
  • In the conventional aroma delivery devices described above, it is difficult to consistently and precisely control delivery of the sprayed material. For example, in the case of an aromatic candle or other aroma delivery device that operates by using heat causing evaporation, some degree of evaporation will continue after the candle has been blown out or the device has been switched off. In addition, such devices generate an aroma a single aroma, continuously as long as the device is activated. This causes saturation of the olfactory senses and the perceived fragrance declines. Also, aerosol cans and pump sprays may produce large droplets which do not vaporize well and tend to rapidly fall under gravity and settle, also resulting in a continuous or lingering aroma which may degrade with time. Other devices, such as solid evaporative devices, experience a decay in aroma delivery rate over time.
  • U.S. Pat. No. 5,196,171 to Peltier describes the generation of vapors and/or aerosols by applying a DC voltage to a wick-like, porous emitter. In this case, the wick comprises a porous “capillament assembly” in which is disposed a central conductive electrode. In operation, the liquid provides a means of conducting the charge from the center of the wick to the outer surface where vaporization takes place due to corona discharge. The greatest concentration of vapors is created at the corners and edges (points or sharp radius edges) where the corona discharge forms.
  • Aerosols may also be created by the application of electrohydrodynamic (“EHD”) forces to a liquid. In doing so, the liquid forms a so-called Taylor cone at the EHD comminution site, becomes charged, and forms a jet or ligament which separates, or comminutes, into an aerosol. In utilizing EHD, it is desirable to keep voltages low to avoid corona discharge which is detrimental to the formation of aerosols. U.S. Pat. No. 5,337,963 to Noakes describes a spraying device which comprises a vertically-disposed capillary tube with one end immersed in a fragrance-producing oil. When an electrical potential is applied to the bulk liquid, generally near the submerged end of the capillary, the liquid is sprayed from the top end as a plurality of ligaments which break up into droplets. The applied electrical potential is reported to be in the range of 10-25 kV and must be high enough to cause EHD comminution at the top of the capillary. Liquid is fed by capillary action from a reservoir to the top end of the capillary for aerosolization. U.S. Pat. No. 5,503,335 to Noakes describes a similar spraying device, but which comprises a wick in place of the aforementioned capillary tube. The wick is fabricated from material having an open-celled structure. In this case as well, the high voltage is applied to the bulk liquid, generally near the submerged end of the wick. U.S. Pat. No. 5,810,265 to Cornelius et al. describes yet another similar spraying device, but which capillary structure comprises a hollow capillary tube having a convoluted inner surface to enhance capillary action. Similarly, the high voltage is applied to the bulk liquid, also generally near the submerged end of the capillary tube. Finally, U.S. Pat. No. 5,655,517 to Coffee describes a device for dispensing a comminuted liquid comprising a comminution site provided by fibers formed into a bundle projecting from an end surface or edge.
  • In the delivery devices described above, it is difficult to consistently and precisely control delivery of the spray. While EHD spraying offers many advantages, including the ability to produce consistent sprays of aerosol particles having a narrowly-tailored size distribution, significant inconsistencies were observed in the delivery rate of the liquid to the surrounding air.
  • It is, therefore, an object of the present invention to provide an aerosol delivery device that avoids or at least reduces adverse effects on an aroma resulting from the manner in which the aroma is delivered. It is another object of the present invention to provide an aerosol delivery device that enables improved control of delivery rate of the aerosol. It is yet another object of the invention to provide an aerosol delivery device that offers consistent aerosol delivery over the reservoir volume. It is a further object of the present invention to provide a method that offers the advantages of reduced adverse effects on the aroma, consistent aerosol delivery of the aroma, and improved capability for rapid vaporization.
  • It is a further object of the present invention to provide a device and method for delivering other formulations that benefit from dispersion as an aerosol. These include, for example, anti-microbial agents; insect repellants; attractants; sterilizers; confusants; pheromones; fumigants; odor neutralizers; therapeutic agents, such as menthol and eucalyptus; animal mood control agents; household cleaning products, such as surface cleaning agents, surface modification agents for aesthetic benefits, surface protection agents, and sanitization/disinfectant agents; household laundry care products, such as stain-removing agents, fabric fresheners, and other fabric treatment agents for aesthetic benefits; personal cosmetic care products for body cleaning, body lotion, and sunscreen products for humans; and consumer adhesives. Formulations, especially for aromas, are oil-based, but other carriers may be used such as water, polymers, or organic solvents.
  • BRIEF SUMMARY OF THE INVENTION
  • In one aspect, the present invention provides a method of using EHD to create a spray having a generally-consistent flowrate, preferably an aerosol spray that rapidly vaporizes; wherein capillary action wicks a liquid from a liquid source to an EHD comminution site; a first electrical potential, preferably a high-voltage potential, is applied to a location away from the liquid source and near the EHD comminution site, preferably in or near a tapered portion of a capillary element; a second electrical potential, preferably a ground, is applied to a location external to the EHD comminution site, preferably to enhance the spray without directing the spray.
  • In another aspect, the present invention provides a method of using EHD to create a spray, preferably an aerosol spray, wherein the spray is controllably emitted intermittently at a generally-consistent flowrate.
  • In another aspect, the present invention provides a method of using EHD to maintain a desired/perceived level of fragrance over an extended period of time (e.g., weeks or months).
  • In another aspect, the present invention provides a method of using EHD to create a spray, preferably an aerosol spray, by providing a length of capillary wick having a first and second segments contiguous at a first location, the second segment including at least one EHD comminution site; contacting the capillary wick first segment with a liquid source at a second location spaced from the first location; applying a first electrical potential to the capillary wick at the first location; positioning a reference electrode, preferably a ground, external to the capillary wick; and electrohydrodynamically producing a spray, preferably an aerosol spray, from the at least one EHD comminution site at a generally-consistent flowrate.
  • In yet another aspect, the present invention provides an EHD apparatus for creating a generally-consistent flowrate spray, preferably an aerosol spray, comprising a reservoir for containing a source of EHD-comminutable liquid; a capillary element, preferably a capillary wick, comprising an EHD comminution site, positioned to contact the liquid source; a first charge source, preferably a high-voltage electrode, positioned in a spaced-apart relation to the liquid source and operably proximate the EHD comminution site; and a second charge source, preferably a ground, positioned external to the EHD comminution site.
  • In yet another aspect, the present invention provides an EHD apparatus for creating a generally-consistent flowrate spray, preferably an aerosol spray, comprising a first charge source, preferably a high-voltage electrode, positioned in contact with the capillary element.
  • In yet another aspect, the present invention provides an EHD apparatus for creating two or more generally-consistent flowrate sprays, preferably aerosol sprays, comprising two or more optionally curvilinear capillary wicks in liquid contact with two or more sources of EHD-comminutable liquid.
  • In yet another aspect, the present invention provides an EHD apparatus for creating a generally-consistent flowrate spray, preferably an aerosol spray, comprising a housing formed to include an aperture, the aperture formed to include a charge source; a source of EHD-comminutable liquid; a capillary wick, comprising an EHD comminution site, the capillary wick at least partially within the aperture, the EHD site external to the housing, and the capillary wick in liquid communication with the liquid source; and a ground operably proximate the EHD comminution site.
  • BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
  • The following detailed description of the embodiments of the invention will be more readily understood when taken in conjunction with the following drawings, wherein:
  • FIG. 1 is a schematic cutaway of an embodiment of the present invention and illustrating its components.
  • FIG. 2 is a partial detailed schematic cutaway of the embodiment of the present invention shown in FIG. 1.
  • FIGS. 3 a-3 h are schematic cutaways of various capillary means with associated electrodes according to further embodiments of the present invention.
  • FIG. 4 is a schematic cutaway of an embodiment of the present invention illustrating optional curvilinear capillary elements and an optional offset reservoir.
  • FIG. 5 is a schematic cutaway of an embodiment of the present invention illustrating a spray device comprising a taper-like candle configuration and showing a narrow and deep liquid reservoir.
  • DETAILED DESCRIPTION OF THE INVENTION
  • EHD comminution entails the use of high voltages to charge liquids so that the electric charge on the liquid overcomes the surface tension of the liquid and the liquid is broken up, or comminuted, into a spray of fine aerosol droplets. In doing so, droplet size and droplet size distribution may be closely controlled. Droplet size may be in the sub-micron range, thus enabling rapid vaporization of the aromatics without denaturing and effecting a rapid onset of a perceived fragrance. Turning to FIGS. 1 and 2, to induce this action, the liquid must experience a high electric field, but preferably only at the point of comminution, known as the spray site, or EHD comminution site 35. To accomplish this, the bulk liquid 29 in the reservoir 32 may be charged and the charge is conducted through the liquid to the EHD comminution site 35 at the tip of the delivery column 34. To create the required electric field, an opposing electrode, often referred to as a reference or inducing electrode, and often a ground 26, is spaced away from the spray site 35 to help generate a well-defined field. In applications where the liquid exhibits relatively high resistivity, such as with many aroma oils, or is semi-conductive, it is possible to induce a potential differential across the liquid itself if sufficiently high voltage is applied between the reservoir 32 and the reference electrode 26 and electric current flows through the highly-resistive liquid. As this happens, however, undesirably high levels of electric field pumping may occur.
  • There are, in fact, two liquid movement mechanisms at play. The first is the capillary action associated with the liquid interaction (liquid surface tension, dynes/cm) with the surface energy of the capillary means (dynes/cm). The second is the electric field pumping due to the high voltage imposed on the liquid to induce aerosolization. It has been found that when a high-voltage charge sufficient to induce EHD spraying is applied to the bulk liquid, even near the capillary inlet for aroma and aerosol generation, a high degree of liquid delivery variability results at the EHD spray site at the opposite end of the capillary. It is believed that high-voltage pumping may contribute to the mechanism of liquid movement in the capillary at voltages necessary for EHD spraying, and that the voltage gradient along the capillary results in inconsistent movement through the capillary voids, particularly when fluid levels' in a supply reservoir change over time.
  • Turning again to FIGS. 1 and 2, an embodiment of the present invention is shown. The dispensing device 10 generally comprises a housing 12; a liquid source 29, preferably contained within a reservoir 32; a voltage source, generally an electrode 31; a capillary element 34 terminating in an EHD comminution site 35, generally, a capillary element with an associated electrode 31; and a reference electrode, or ground 26, 27. Additionally, the dispensing device 10 may comprise a removable cap 14 that allows access to the internal components of the device 10, a base 16 to further contain the internal components and to provide a stable platform for the device 10 when placed upon a horizontal surface, a battery 18, a high-voltage power supply 22 to convert voltage (e.g., 9V) from the battery 18 to the higher, kV-level voltage required for operation of the device 10, a circuit board 20 to handle the electronics functions such as timing, voltage control, operational indicators (e.g., lights, and control of intensity and delivery rate), a high-voltage lead 30 running between the output of the high-voltage power supply 22 and the electrode 31, and a switch 24 to control operation of the device 10. The optional light (not shown) may optionally contribute to a burning candle-like appearance for the device 10 or may be used to illuminate the spray, evoking a fountain-like effect. Optionally, the device may also comprise various control features to allow a user to adjust the spray and timing of the device.
  • In operation, liquid is supplied to the delivery column 34, 64 (e.g., FIG. 3 c) from the liquid source 29. The delivery column 34, 64 generally comprises a capillary element 46, 66 (FIG. 3) which may be formed from a capillary tube 46 (FIG. 3 a) or a wick 66 (FIG. 3 c) which will enable the liquid to be drawn toward the EHD comminution site tip 35 where a voltage charge causes the liquid to EHD comminute into an aerosol. As described above, placement of the electrode 31, 68 is important to providing consistent liquid and aerosol delivery rates. Capillary action has been shown to be an effective method for moving liquid from the reservoir 32 to the EHD comminution site 35. However, there may be inconsistencies in delivery rate of the liquid to the site 35 and of the aerosol to the surrounding air, possibly caused by electric field pumping, the result of the high voltage imposed on the liquid to induce aerosolization causing electric current flow through the liquid. This high voltage over the entire length of the delivery column 34, 64, however, is believed to cause electric field pumping to contribute to and result in inconsistent liquid flow rates. By minimizing this electric potential differential over the liquid path, consistent liquid delivery rates may be achieved. Advantageously, by using the capillary element 46, 66 to move liquid from the liquid source 29 to the EHD comminution site 35, active pumping of any kind, including positive-displacement, is avoided. Importantly, too, the flowrate of the spray can remain generally-consistent over the delivery of the liquid in the reservoir 32.
  • Many capillary elements are possible. The important attribute is the ability to deliver the liquid from the liquid source 29 to the EHD comminution site 35. The rate of capillary delivery must be sufficient to at least match the rate of EHD comminution or the EHD comminution site 35 will be starved of liquid and aerosolization will cease, or at a minimum aerosolization oscillates as liquid partially replenishes the EHD comminution site 35 and is sprayed away. Capillary tubes 46 (FIG. 3 a), capillary tubes 46 filled with a porous material 56 (FIG. 3 b), and fiber-like wicks 66 (FIGS. 3 c-3 h) have been used successfully. A sample of common off-the-shelf paper towel material formed into a capillary element has been used successfully.
  • Tubing materials include ABS, rigid PVC, polyester, polyamide, glass, Teflon® (poly-tetrafluoroethylene), PEEK, and polyimide. To maximize the capillary action using polymer tubes, an acceptable adhesion to the tube occurs when the surface energy of the polymer is greater than the surface tension of the liquid, preferably about 8-10 dynes/cm or more greater than the surface tension of the liquid. In spraying aromatic oils with surface tensions in the range of 27-30 dynes/cm, for example, preferred materials would include (with representative surface energy values) ABS (35-42 dynes/cm), rigid PVC (39 dynes/cm), polyester (41-44 dynes/cm), polyamide (ca. 36 dynes/cm), and polycarbonate (46 dynes/cm). While preferred, the capillary tube 46 need not be a single element. Multiple tubes and multiple tubes clustered together may be used. The capillary tube 46 need not be limited to a cylinder with a single opening. For example, two or more tubes may be coaxially combined to create a central aperture along with one or more annular apertures.
  • In accordance with the present invention, open-cell, porous, or fiber-like wicks are most preferred for spraying aromatic aerosols. By way of example only, and not limitation, wicks include plotter pen wicks, felt nibs, china bristles, twisted nylon twine, braided shoelaces, foam materials, and candle wicks. Materials may be polymeric, such as polyester, or natural, such as cotton. Exemplary, the porous wicking material has an open cell structure with a porosity of about 40 percent. Preferably, the voids have consistent size and shape and the wicks exhibit uniformity from one wick to another. Preferably, each wick has a well-defined tapered, conical tip that is consistent from wick to wick. Preferably, each conical tip has a low height-to-diameter aspect ratio, but high enough to provide an effective EHD comminution site 35.
  • Further, the present invention enables flexibility in design. Multiple capillary elements or wicks (FIG. 4) may be configured with multiple reservoirs (not shown) within the same dispensing device. As shown in FIG. 4, the capillary elements 166 may have curvilinear shapes to allow for placement of the spray sites, and positioning of the reservoir(s) 132 and other internal operational elements as required for a particular application. The size and shape of the other elements or desired placement of replaceable reservoirs may dictate non-symmetrical apparatus designs, irregularly-shaped reservoirs 132, and curvilinear capillary elements 166. There may be multiple spray sites drawing from a single reservoir. Where there are multiple reservoirs (not shown), multiple liquids may be sprayed either simultaneously or in a timed sequence. This latter capability enables the ability to dispense a first aroma and then cycle through separate aromas, thereby providing a continuous level of perceived fragrances and avoiding the phenomenon of olfactory saturation.
  • A key element in the present invention is the placement of the electrode 48, 68 relative to the capillary element 46, 66, specifically relative to the EHD comminution site 35. As discussed above, if the electrode 48, 68 is placed in the bulk liquid in the reservoir 32, even if placed near the bulk liquid end of the capillary element 46, 66 in the liquid, high voltages are required to effect aerosolization at the EHD comminution site 35, especially with liquids having high resistivities, with resultant high levels of electric field pumping which produce inconsistent delivery rates.
  • Viewing the capillary element 46, 66 as a column of liquid, it acts as a resistive element to the electric potential between the electrode 68′ (FIG. 3 c) and the EHD comminution site 35 at the end of the capillary element 46, 66. A longer path effects a higher resistance and voltage drop which leads to the need for a higher electric potential and a less-consistent flowrate of aerosol. By reducing the distance between the EHD comminution site 35 and the electrode 68, the resistance and voltage drop decrease, the required voltage decreases, and a more-consistent flowrate of aerosol results. Thus, the present invention limits electric field pumping to a smaller length of the capillary element 46, 66. However, as shown in FIG. 3, the electrode 48, 68, 78, 88, 88′, 98, 98′, 108 does not extend beyond the EHD comminution site 35; some material of the capillary element covers or extends beyond the electrode. This is where the liquid gathers via capillary action to be available to the high-voltage charge to aerosolize it. As a result, the present invention improves delivery rates, allowing for consistent, repeatable delivery rates over time. In the field of aroma delivery, for example, this may be very desirable.
  • The main factors in placing the electrode 68 to reduce or eliminate electric field pumping is proximity to the spray tip 35 and sharpness of the tip 35. Minor factors include liquid resistivity, capillary uptake, aerosolization rate, and position of the ground 26. In practice, the electrode 68 must be placed operably, or effectively, proximate the EHD comminution site 35. That is, the position of the electrode 68 relative to the EHD comminution site 35 must be adjusted to produce a consistent aerosol delivery rate given the properties noted above. Not only may consistent delivery rates be achieved during each “on” cycle (discussed below), consistent delivery rates may be achieved over extended periods of “on” and “off” cycles.
  • As a measure of consistency over a series of tests, the percent Cv was calculated by dividing the standard deviation by the mean. This measurement allows for comparing equally various wicks and configurations. The lower the Cv, the more consistent the flowrate. By changing the charge location, for example from 68′ to 68, the percent Cv improved (was reduced) in the range of three to 15 percentage points. For example, one wick improved from 28.7 percent Cv to 19.3 percent Cv. For aromas, the preferred percent Cv is less than 20, more preferably less than ten. Much below ten percent is barely discernable by the average human olfactory senses. In general, the position of the charge electrode 68 has been found to be within the conical portion of the spray tip. As an example, for non-conducting wicks tested, the position of the charge source 68 has been in the range of 0.020 inches to 0.250 inches from the comminution site 35 to the charge point 68. The measurement for a conducting wick would be virtually zero.
  • Numerous electrode embodiments are feasible, all producing the same desired result of improved consistency of aerosol delivery rates with reduced electric field pumping. Importantly, as discussed above, the electrode 68 is placed away from the bulk liquid and the liquid uptake and nearer the EHD comminution site 35 to reduce the large voltage differential between the electrode 68 and the EHD comminution site 35. Illustrated in FIG. 3 are various possible electrode configurations relative to the capillary element 64 and the EHD comminution site 35. FIG. 3 a shows a basic capillary element 44 comprising a capillary tube 46 with a voltage source electrode 48 positioned within the tube 46. As liquid is drawn into the tube 46, the electrode 48 provides a charge at the EHD comminution site 35 sufficient to aerosolize the liquid. The effects of electric field pumping are limited to that portion of the tube 46 between the voltage source electrode 48 and the EHD comminution site 35. FIG. 3 b shows a similar arrangement, but with a porous material 56 disposed within the capillary tube 46. Operation of the capillary element 54 shown in FIG. 3 b is similar to that of the capillary element 44 shown in FIG. 3 a. As shown in FIG. 3 c, a capillary element 64 may comprise a porous wick 66 into which is inserted a voltage source electrode 68. The embodiment shown in FIG. 3 c provides a voltage source 68 inserted into the wick 66 near the EHD comminution site 35. As in the previous embodiments, the electric field pumping is controlled and consistent aerosol delivery results. With just the voltage source electrode 68 operative, it is possible, in some embodiments, to have small amounts of undesirable electric field pumping downward and counter to the upward capillary action flow. This may be countered by positioning an additional voltage source electrode 68′ as shown. Thus, the electrical potential across the wick 66 may be equalized, or nearly so, and there is little or no counter electric field pumping. Turning now to FIG. 3 d, yet another embodiment of a capillary element 74 is shown. Here, a voltage source electrode 78 comprises a helical coil positioned coaxial with the porous wick 66. As long as the voltage source electrode 78 is positioned operably proximate the porous' wick 66, whereby a sufficient charge is imposed on the liquid, electric field pumping is controlled, and consistent aerosol delivery results. Counter electric field pumping is also minimized or eliminated. FIGS. 3 e-3 h illustrate yet other embodiments of the capillary element 84, 94, 104, 114 of the present invention. The voltage source electrode 88, 98, 108, 118 may comprise a sheath surrounding the porous wick 66 as shown or, alternatively, the voltage source electrode may comprise arcuate tabs or the like (not shown) which may be positioned operably proximate the porous wick. Finally, FIGS. 3 g and 3 h illustrate an embodiment wherein a portion of the housing 12 or reservoir cover 33 is formed to include the voltage source electrode 108, 118. Plastic materials of construction (with their respective nominal ohm/square resistivities) for such voltage source electrodes 108, 118 include anti-static (E9-E12), static dissipative (E6-E9), and conductive plastics (E3-E6).
  • To improve aerosol delivery, maximize aroma dispersion, and improve plume intensity and shape, it is preferred to place a ground or other reference electrode 26 operably proximate the EHD comminution site 35. FIGS. 1 and 2 show an example of the placement of the ground 26. If the ground 26 is placed too far from the EHD comminution site 35, the charge at the site 35 does not “see” the ground 25 and its effects are not noticeable. If the ground 26 is placed too close to the EHD comminution site 35, the aerosol spray may be misdirected toward the ground 26. Preferably, the ground 26 is placed to generate an electric field required to produce an aerosol without causing the spray to be attracted to the ground 26. The optimal position of the ground 26 will depend upon the particular configuration of the device 10. The liquid properties, particle size, spray site geometry, and corresponding electric field potential needed may affect the placement of the ground 26. Referring to FIG. 1, the ground 26 is positioned off to the side and near the top of the delivery module 28 or just below the capillary element 34. The ground 26 may be a neutral or opposite charge to the aerosol particles spraying from the EHD comminution site. Alternatively, depending upon the application, the electrode 26 may be disposed closer to the site 35 to purposely direct the aerosol spray. If desired, the ground 26 may comprise an adjustment (not shown) to allow varying of the position of the ground 26. The materials used for the ground 26 may be any conductor, including, but not limited to, metals and plastics. The aerosol produced is preferably charged, but may be discharged and dispersed as neutral particles for selected applications. Alternatively, an external ground reference electrode 26 may be utilized. For example, an object or an animal, human or otherwise, may provide the ground reference.
  • Preferably, various timing and control mechanisms are included as elements on the circuit board 20 or elsewhere. When the device 10 is initially activated in a room to emit an aroma(s), for example, it may be desirable to introduce a quantity of aroma sufficient to provide scent to the entire room after which the device 10 would shut off. Later, it may be desirable to periodically introduce a “maintenance” amount of scent to keep the level in the room constant and to counter the tendency of aromas to deaden or desensitize the sense of smell over time. This could be done by timing short sprays of perhaps several seconds duration with longer periods of quiescence. Such timing could also be used with multiple sprays having the same or different formulations. Depending upon the strength of the aroma, longer “on” times, upwards of one minute or more, may produce “hot spots” where the fragrance may become overwhelming. In these situations, the “off” time may be a minute or more.
  • Having multiple fragrances in a single dispenser 10 enables several other types of operation. For example, fragrances that are related to each other may collectively produce a “bouquet” effect. By controlling dispensing to specific times of the day, one fragrance may induce an invigorating effect (morning), a calming, or stress-relieving effect (midday), and yet another, a relaxing effect (evening).
  • Using a timing mechanism the device 10 may maintain a constant delivery rate even if fluid flow rate declines over time. For example, the delivery rate may be maintained through shorter spray intervals within a spray cycle time. Thus, if less liquid flows through the capillary wick 66 over time, a spray “on” interval may increase from, for example, five seconds to greater than five seconds. Alternatively, or in combination, the “off” time interval may decrease from, for example, 45 seconds to less than 45 seconds. These timing schemes can create an effective or perceived level of constant aroma delivery to the air.
  • Many aromatic formulations have resistivities of greater than 5 E3 ohm-cm and surface tensions of between ten to about 50 dynes/cm. To produce an aerosol from these formulations, typical voltage levels are 3-10 kV and higher. For cost and battery-life considerations, it is preferred to maintain the required voltage to a minimum. Flowrates may be 0.005-0.100 μL/sec and delivery rates 5-50 mg/hr.
  • While the invention has been described in connection with specific embodiments for the purposes of illustration and description, it is not intended to be exhaustive or to limit the invention to the precise form disclosed. Numerous modifications and variations are possible in light of the above teaching. It is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.

Claims (46)

1. A method, comprising the steps of:
contacting a capillary wick, comprising an EHD comminution site, with a liquid source, whereby at least a portion of the liquid transports to the EHD comminution site;
applying a first electrical potential to the liquid within the capillary wick at a location spaced apart from the liquid source and proximate the EHD comminution site;
applying a second electrical potential at a location external to the EHD comminution site;
comminuting at least a portion of the liquid EHD; and
forming a spray having a generally-consistent flowrate.
2. The method of claim 1, wherein:
the spray comprises aerosol particles.
3. The method of claim 2, wherein:
the aerosol particles comprise an aromatic fragrance.
4. The method of claim 1, further comprising the steps of:
selecting the first electrical potential; and
locating the application of the first electrical potential, wherein generally-consistent electric field pumping is effected between the location of the first electrical potential and the EHD comminution site.
5. The method of claim 1, further comprising the step of:
selecting the second electrical potential; and
locating the application of the second electrical potential, wherein the spray is enhanced without creating backspray.
6. The method of claim 1, wherein:
the second electrical potential is ground.
7. The method of claim 6, wherein:
the ground is an animal.
8. The method of claim 1, further comprising the steps of:
providing a liquid source of volume, V; and
dispensing the volume V as at spray at a generally-consistent flowrate.
9. The method of claim 1, wherein:
the first electrical potential is applied at a location within 0.250 inches of the EHD comminution site.
10. The method of claim 1, wherein:
the first potential is between 3 and 10 kV.
11. The method of claim 1, wherein:
the liquid comprises material chosen from the group consisting of fragrance; antimicrobial agents; insect repellants; attractants; sterilizers; confusants; pheromones; fumigants; odor neutralizers; therapeutic agents, such as menthol and eucalyptus; animal mood control agents; household cleaning products, such as surface cleaning agents, surface modification agents for aesthetic benefits, surface protection agents, and sanitization/disinfectant agents; household laundry care products, such as stain-removing agents, fabric fresheners, and other fabric treatment agents for aesthetic benefits; personal cosmetic care products for body cleaning, body lotion, and sunscreen products for humans; and consumer adhesives.
12. The method of claim 1, wherein:
the liquid has a resistivity of greater than 5 E3 ohm-cm.
13. The method of claim 1, wherein:
the generally-consistent flowrate has a Cv of less than 20 percent.
14. The method of claim 1, further comprising the step of:
providing a liquid source of volume V;
applying the first electrical potential intermittently; and
dispensing the volume V intermittently as an intermittent spray at a generally-consistent flowrate over time.
15. The method of claim 14, wherein:
the step of intermittently spraying includes the step of dispensing the volume V in intermittent sprays of substantially equivalent volume.
16. The method of claim 15, wherein:
the total flowrate difference between intermittent sprays has a Cv of less than 20 percent.
17. The method of claim 14, wherein:
the total flowrate over time has a Cv of less than 20 percent.
18. The method of claim 1, further comprising the step of:
varying the voltage of the first electrical potential.
19. The method of claim 1, further comprising the step of:
adjusting the location of the application of the first electrical potential relative to the EHD comminution site.
20. The method of claim 3, further comprising the step of:
maintaining a perceived level of fragrance for at least 30 days.
21. A method of delivering consistent aerosol flow from a capillary wick, comprising the steps of:
providing a length of capillary wick having first and second segments contiguous at a first location, wherein the second segment includes at least one EHD comminution site;
contacting the capillary wick first segment with a liquid source at a second location spaced from the first location;
applying a first electrical potential to the capillary wick at the first location;
positioning a reference electrode having a second electrical potential external to the capillary wick; and
electrohydrodynamically producing a spray from the at least one EHD comminution site at a generally-consistent flowrate.
22. The method of claim 21, wherein:
the spray comprises aerosol particles.
23. A method, comprising the steps of:
contacting each of at least two capillary wicks, each wick comprising at least one EHD comminution site, with respective liquid sources, whereby at least a portion of the liquid from each source transports to the respective EHD comminution site;
applying a first electrical potential to the liquid within each of the at least two capillary wicks at a location spaced apart from each respective liquid source and proximate each respective EHD comminution site; and
applying a second electrical potential at a location external to each EHD comminution site, wherein at least a portion of the liquid EHD comminutes to form a spray having a generally-consistent flowrate.
24. The method of claim 23, wherein:
the step of applying a first electrical potential comprises applying an electrical potential different from the first electrical potential to one or more of the capillary wicks.
25. An apparatus, comprising:
a reservoir;
a capillary element positioned to contact a liquid source contained within the reservoir, the capillary element comprising:
an EHD comminution site;
a first charge source positioned in a spaced-apart relation to the liquid source and proximate the EHD comminution site; and
a second charge source positioned external to the EHD comminution site, whereby upon activating the first charge source at least a portion of the liquid EHD comminutes to form a spray having a generally-consistent flowrate.
26. The apparatus of claim 25, wherein:
the capillary element further comprises a capillary wick.
27. The apparatus of claim 25, wherein:
the capillary element is formed from a material having a surface energy at least eight dynes/cm greater than the surface tension of the liquid.
28. The apparatus of claim 26, wherein:
the capillary element comprises a first capillary tube positioned co-axially within a second capillary tube, thereby forming an annulus and a second EHD comminution site.
29. The apparatus of claim 28, further comprising:
a third charge source positioned in a spaced-apart relation to the liquid source and proximate the second EHD comminution site.
30. The apparatus of claim 26, wherein:
the capillary element further comprises a substantially non-conducting portion.
31. The apparatus of claim 30, wherein:
the non-conducting portion is between the second charge source and the EHD comminution site.
32. The apparatus of claim 26, wherein:
the capillary element is substantially non-conducting.
33. The apparatus of claim 26, wherein:
the capillary element EHD comminution site is substantially non-conducting.
34. The apparatus of claim 26, wherein:
the first charge source is within 0.250 inches of the EHD comminution site.
35. The apparatus of claim 26, wherein:
the first charge source is within the capillary element.
36. The apparatus of claim 26, wherein:
the first charge source comprises an arcuate tab; and
the tab is in charge contact with the capillary wick.
37. The apparatus of claim 26, wherein:
the first charge source substantially forms a helix surrounding, and coaxial with, the capillary wick.
38. The apparatus of claim 26, wherein:
the first charge source comprises an at least partial sheath around the capillary wick.
39. The apparatus of claim 25, wherein the capillary element is chosen from the group consisting of porous material disposed within one or more hollow tubes, a porous wick, compressed fibers, open-celled material, paper, cloth, porous plastic material, and combinations thereof.
40. The apparatus of claim 26, further comprising one or more additional capillary wicks.
41. The apparatus of claim 26, wherein the capillary wick is curvilinear.
42. The apparatus of claim 26, further comprising:
one or more additional reservoirs; and
one or more additional capillary wicks.
43. The apparatus of claim 25, further comprising means for enabling a user to adjust the position of the second charge source relative to the EHD comminution site.
44. The apparatus of claim 25, further comprising means for enabling a user to adjust the position of the first charge source.
45. An apparatus, comprising:
a housing formed to include an aperture;
a charge source;
a source of EHD-comminutable liquid;
a capillary wick, comprising an EHD comminution site, the capillary wick at least partially disposed within the aperture, the EHD comminution site positioned external to the housing, and the capillary wick in liquid communication with the liquid source; and
a ground proximate the EHD comminution site.
46. The apparatus of claim 45, wherein:
the housing is a least translucent and is further formed in the shape of a candle, the apparatus further including a light-emitting element disposed within the housing, wherein when light emitted from the light-emitting element is visible from outside the housing.
US11/351,832 2005-02-11 2006-02-10 Aerosol dispensing device and method Expired - Fee Related US7798420B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/351,832 US7798420B2 (en) 2005-02-11 2006-02-10 Aerosol dispensing device and method
US12/859,867 US8141795B2 (en) 2005-02-11 2010-08-20 Aerosol dispensing device and method

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US65205705P 2005-02-11 2005-02-11
US65206005P 2005-02-11 2005-02-11
US65206705P 2005-02-11 2005-02-11
US65205905P 2005-02-11 2005-02-11
US65206405P 2005-02-11 2005-02-11
US11/351,832 US7798420B2 (en) 2005-02-11 2006-02-10 Aerosol dispensing device and method

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/859,867 Continuation US8141795B2 (en) 2005-02-11 2010-08-20 Aerosol dispensing device and method

Publications (2)

Publication Number Publication Date
US20060180143A1 true US20060180143A1 (en) 2006-08-17
US7798420B2 US7798420B2 (en) 2010-09-21

Family

ID=36570954

Family Applications (2)

Application Number Title Priority Date Filing Date
US11/351,832 Expired - Fee Related US7798420B2 (en) 2005-02-11 2006-02-10 Aerosol dispensing device and method
US12/859,867 Expired - Fee Related US8141795B2 (en) 2005-02-11 2010-08-20 Aerosol dispensing device and method

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/859,867 Expired - Fee Related US8141795B2 (en) 2005-02-11 2010-08-20 Aerosol dispensing device and method

Country Status (7)

Country Link
US (2) US7798420B2 (en)
EP (1) EP1848542A1 (en)
JP (1) JP2008544834A (en)
CN (1) CN101137446B (en)
CA (1) CA2597321A1 (en)
MX (1) MX2007009668A (en)
WO (1) WO2006086655A1 (en)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090088700A1 (en) * 2007-09-27 2009-04-02 Olympus Corporation Apparatus and method for liquid spray administration
US20090194607A1 (en) * 2007-08-29 2009-08-06 Philip Morris Usa Inc. Pulsed aerosol generation
US20100288860A1 (en) * 2008-01-22 2010-11-18 Yume Inokuchi Electrostatic sprayer
US20100294852A1 (en) * 2009-05-21 2010-11-25 Banco Michael J Methods of Dispensing Two or More Volatile Materials
WO2011038171A1 (en) * 2009-09-28 2011-03-31 Battelle Memorial Institute Electro-hydrodynamic spray device
US20110174304A1 (en) * 2010-01-21 2011-07-21 Triplett Ii Michael D Electrohydrodynamic aerosolization device having a time varying voltage
US20110309157A1 (en) * 2009-10-09 2011-12-22 Philip Morris Usa Inc. Aerosol generator including multi-component wick
US20120187209A1 (en) * 2009-05-11 2012-07-26 Monash University Microfluidic apparatus for the atomisation of a liquid
KR20140039550A (en) * 2012-09-24 2014-04-02 엘지전자 주식회사 Electrostatic atomizing device using a disposable capsule
WO2014145372A1 (en) * 2013-03-15 2014-09-18 San Jamar, Inc. Apparatus for metered dose of odor control substance
US9453330B2 (en) 2012-10-29 2016-09-27 Xela Innovations, Llc Fixture cleaning and deodorizing apparatus and method of use
US9526808B2 (en) 2009-10-13 2016-12-27 Philip Morris Usa Inc. Air freshening device
US9663932B2 (en) 2012-10-29 2017-05-30 Xela Innovations, Llc Fixture cleaning and deodorizing apparatus and method of use
US20180035717A1 (en) * 2014-12-15 2018-02-08 Philip Morris Products S.A. E-liquid collapsible cartridge
US20190153623A1 (en) * 2017-11-21 2019-05-23 Kao Corporation Electrospinning apparatus and systems and methods thereof
WO2019105812A1 (en) * 2017-11-30 2019-06-06 Philip Morris Products S.A. Systems for generating a liquid aerosol
US10368582B2 (en) 2012-07-16 2019-08-06 Nicoventures Holdings Limited Electronic vapor provision device
US10495323B2 (en) * 2014-04-22 2019-12-03 Lg Electronics Inc. Air conditioner and operating method thereof
WO2021028217A1 (en) * 2019-08-14 2021-02-18 Philip Morris Products S.A. An aerosol-generating device and a method of generating a mixed aerosol
US11083856B2 (en) 2014-12-11 2021-08-10 Nicoventures Trading Limited Aerosol provision systems
US11089915B2 (en) 2019-10-25 2021-08-17 Xela Innovations, Llc Dispenser for use with refill cartridge
USD936195S1 (en) 2019-10-25 2021-11-16 Xela Innovations, Llc Dispenser
US11253671B2 (en) 2011-07-27 2022-02-22 Nicoventures Trading Limited Inhaler component
US11369710B2 (en) 2019-05-16 2022-06-28 Dispensing Dynamics International, Inc. Fragrance dispensers and methods
US11744964B2 (en) 2016-04-27 2023-09-05 Nicoventures Trading Limited Electronic aerosol provision system and vaporizer therefor

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5149095B2 (en) * 2008-07-28 2013-02-20 パナソニック株式会社 Electrostatic atomizer and air conditioner using the same
AT508244B1 (en) * 2010-03-10 2010-12-15 Helmut Dr Buchberger INHALATORKOMPONENTE
US8464905B2 (en) 2010-10-29 2013-06-18 S.C. Johnson & Son, Inc. Dispensers and functional operation and timing control improvements for dispensers
US8646661B2 (en) 2011-03-23 2014-02-11 Alan Paine Aerosol can liquid dispenser
GB2492154B (en) * 2011-06-24 2016-02-17 Reckitt & Colman Overseas Devices and methods for emanating liquids
WO2013043696A2 (en) 2011-09-19 2013-03-28 S.C. Johnson & Son, Inc. Spray dispenser
JP6329130B2 (en) * 2012-04-10 2018-05-30 アイノビア,インコーポレイティド Spray ejector mechanism, device that provides charge separation and controllable droplet charge, and low dose eye drops
CA2873508A1 (en) 2012-05-15 2013-11-21 Eyenovia, Inc. Ejector devices, methods, drivers, and circuits therefor
US9108782B2 (en) 2012-10-15 2015-08-18 S.C. Johnson & Son, Inc. Dispensing systems with improved sensing capabilities
KR102136157B1 (en) * 2013-08-23 2020-07-21 엘지전자 주식회사 Electrostatic spray device
KR102077564B1 (en) * 2013-08-30 2020-02-14 엘지전자 주식회사 Electrostatic spray module and Air conditioner having the same
GB2529201A (en) 2014-08-13 2016-02-17 Batmark Ltd Device and method
US10814028B2 (en) * 2016-08-03 2020-10-27 Scentbridge Holdings, Llc Method and system of a networked scent diffusion device
CN106423696B (en) * 2016-09-07 2019-04-16 中国科学院宁波材料技术与工程研究所 Multi channel currents body sprays scanning system

Citations (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356528A (en) * 1976-07-15 1982-10-26 Imperial Chemical Industries Plc Atomization of liquids
US4580721A (en) * 1981-02-12 1986-04-08 Imperial Chemical Industries Plc Fluid container
US4776515A (en) * 1986-08-08 1988-10-11 Froughieh Michalchik Electrodynamic aerosol generator
US4962885A (en) * 1978-04-17 1990-10-16 Coffee Ronald A Process and apparatus for spraying liquid
US5115131A (en) * 1991-05-15 1992-05-19 The University Of North Carolina At Chapel Hill Microelectrospray method and apparatus
US5121884A (en) * 1990-02-06 1992-06-16 Imperial Chemical Industries Plc Electrostatic spraying devices
US5184778A (en) * 1991-03-13 1993-02-09 Imperial Chemical Industries Plc Electrostatic spraying apparatus
US5196171A (en) * 1991-03-11 1993-03-23 In-Vironmental Integrity, Inc. Electrostatic vapor/aerosol/air ion generator
US5322684A (en) * 1991-07-15 1994-06-21 Elizabeth Arden Co., Division Of Conopco, Inc. Cosmetic delivery system
US5337963A (en) * 1990-11-12 1994-08-16 Imperial Chemical Industries Plc Spraying device
US5503335A (en) * 1991-10-10 1996-04-02 Imperial Chemical Industries Plc Electrostatic spraying device and method of fabrication thereof
US5665517A (en) * 1996-01-11 1997-09-09 Hoechst Celanese Corporation Acidic ion exchange resin as a catalyst to synthesize a novolak resin and photoresist composition therefrom
US5810265A (en) * 1994-09-07 1998-09-22 Reckitt & Colman Products Limited Electrostatic spraying device
US5927618A (en) * 1993-09-02 1999-07-27 The Procter & Gamble Company Electrostatic spraying device
US5975426A (en) * 1998-05-14 1999-11-02 Waters Investments Limited Use of porous beads as a tip for nano-electrospray
US6311903B1 (en) * 1999-08-18 2001-11-06 The Procter & Gamble Company Hand-held electrostatic sprayer apparatus
US6318640B1 (en) * 1992-12-01 2001-11-20 Electrosols, Ltd. Dispensing device
US20020022040A1 (en) * 2000-07-10 2002-02-21 The Proctor & Gamble Company Methods of enhancing delivery of oil-soluble skin care actives
US6397838B1 (en) * 1998-12-23 2002-06-04 Battelle Pulmonary Therapeutics, Inc. Pulmonary aerosol delivery device and method
US6454193B1 (en) * 1999-04-23 2002-09-24 Battellepharma, Inc. High mass transfer electrosprayer
US6457470B1 (en) * 1992-12-22 2002-10-01 Electrosols Ltd. Dispensing device
US20030173219A1 (en) * 2000-04-03 2003-09-18 Davies Lee Adrian Devices and formulations
US6682004B2 (en) * 1999-08-18 2004-01-27 The Procter & Gamble Company Electrostatic spray device
US6684897B2 (en) * 2001-03-08 2004-02-03 Worldwide Oilfield Machine, Inc. Valve actuator and method
US6729552B1 (en) * 2003-04-22 2004-05-04 E. I. Du Pont De Nemours And Company Liquid dispersion device
US6753521B1 (en) * 2000-02-18 2004-06-22 Bruker Daltonics, Inc. Method and apparatus for a nanoelectrosprayer for use in mass spectrometry
US6789741B2 (en) * 2002-03-27 2004-09-14 S. C. Johnson & Son, Inc. Method and apparatus for atomizing liquids having minimal droplet size
US6790408B2 (en) * 1999-07-17 2004-09-14 Reckitt Benckiser (Uk) Limited Fragrance emitting device
US6814315B2 (en) * 2001-08-30 2004-11-09 Nordson Corporation Liquid dispensing manifold with adjustable slide plate
US6832794B2 (en) * 2002-08-16 2004-12-21 The Dial Corporation Methods and apparatus for a dual-outlet vapor dispenser
US7503512B2 (en) * 2003-06-04 2009-03-17 Matsushita Electric Works, Ltd. Electrostatic atomizer and air purifier using the same

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118843A (en) * 1961-04-05 1964-01-21 Gen Mills Inc Method of producing an aerosol
DE3475598D1 (en) 1983-03-25 1989-01-19 Ici Plc Spraying apparatus
US5176312A (en) 1991-08-12 1993-01-05 Brian Lowenthal Selective flow soldering apparatus
US5176321A (en) * 1991-11-12 1993-01-05 Illinois Tool Works Inc. Device for applying electrostatically charged lubricant
GB9406171D0 (en) 1994-03-29 1994-05-18 Electrosols Ltd Dispensing device
ATE263629T1 (en) * 1996-07-23 2004-04-15 Battelle Memorial Institute DEVICE FOR DISPENSING AND METHOD FOR SHAPING A MATERIAL
GB9622623D0 (en) * 1996-10-30 1997-01-08 Ici Plc Dispensing devices
GB9900955D0 (en) * 1999-01-15 1999-03-10 Imperial College Material deposition
KR20020003239A (en) * 1999-04-23 2002-01-10 추후기재 Directionally controlled ehd aerosol sprayer
US7712687B2 (en) 1999-08-18 2010-05-11 The Procter & Gamble Company Electrostatic spray device
US7152817B2 (en) 1999-08-18 2006-12-26 The Procter & Gamble Company Electrostatic spray device
US6814318B2 (en) 1999-08-18 2004-11-09 The Procter & Gamble Company Disposable cartridge for electrostatic spray device
DE10007498B4 (en) 2000-02-18 2006-06-14 CARBOTEC Gesellschaft für instrumentelle Analytik mbH electrospray
US6931202B2 (en) 2000-07-28 2005-08-16 S.C. Johnson & Son, Inc. Electrical evaporator with adjustable evaporation intensity
US6446880B1 (en) 2000-08-02 2002-09-10 S.C. Johnson & Son, Inc. Replaceable reservoir for an atomizing apparatus
GB0115355D0 (en) * 2001-06-22 2001-08-15 Pirrie Alastair Vaporization system
JP4452508B2 (en) 2002-02-25 2010-04-21 ザ プロクター アンド ギャンブル カンパニー Electrostatic spraying equipment
AU2003286502A1 (en) 2002-10-21 2004-05-13 The Government Of The United States Of America, As Represented By The Secretary, Department Of Health And Human Services Contiguous capillary electrospray sources and analytical device
GB0229493D0 (en) 2002-12-18 2003-01-22 Battelle Memorial Institute Aroma dispensing device
GB0308021D0 (en) * 2003-04-07 2003-05-14 Aerstream Technology Ltd Spray electrode
JP3861901B2 (en) * 2004-12-28 2006-12-27 ダイキン工業株式会社 Electrostatic spraying equipment

Patent Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356528A (en) * 1976-07-15 1982-10-26 Imperial Chemical Industries Plc Atomization of liquids
US4962885A (en) * 1978-04-17 1990-10-16 Coffee Ronald A Process and apparatus for spraying liquid
US4580721A (en) * 1981-02-12 1986-04-08 Imperial Chemical Industries Plc Fluid container
US4776515A (en) * 1986-08-08 1988-10-11 Froughieh Michalchik Electrodynamic aerosol generator
US5121884A (en) * 1990-02-06 1992-06-16 Imperial Chemical Industries Plc Electrostatic spraying devices
US5337963A (en) * 1990-11-12 1994-08-16 Imperial Chemical Industries Plc Spraying device
US5382410A (en) * 1991-03-11 1995-01-17 In-Vironmental Integrity, Inc. Electrostatic vapor/aerosol generator with method and apparatus for conditioning building spaces
US5196171A (en) * 1991-03-11 1993-03-23 In-Vironmental Integrity, Inc. Electrostatic vapor/aerosol/air ion generator
US5184778A (en) * 1991-03-13 1993-02-09 Imperial Chemical Industries Plc Electrostatic spraying apparatus
US5115131A (en) * 1991-05-15 1992-05-19 The University Of North Carolina At Chapel Hill Microelectrospray method and apparatus
US5322684A (en) * 1991-07-15 1994-06-21 Elizabeth Arden Co., Division Of Conopco, Inc. Cosmetic delivery system
US5503335A (en) * 1991-10-10 1996-04-02 Imperial Chemical Industries Plc Electrostatic spraying device and method of fabrication thereof
US6318640B1 (en) * 1992-12-01 2001-11-20 Electrosols, Ltd. Dispensing device
US6457470B1 (en) * 1992-12-22 2002-10-01 Electrosols Ltd. Dispensing device
US5927618A (en) * 1993-09-02 1999-07-27 The Procter & Gamble Company Electrostatic spraying device
US5810265A (en) * 1994-09-07 1998-09-22 Reckitt & Colman Products Limited Electrostatic spraying device
US5665517A (en) * 1996-01-11 1997-09-09 Hoechst Celanese Corporation Acidic ion exchange resin as a catalyst to synthesize a novolak resin and photoresist composition therefrom
US5975426A (en) * 1998-05-14 1999-11-02 Waters Investments Limited Use of porous beads as a tip for nano-electrospray
US6397838B1 (en) * 1998-12-23 2002-06-04 Battelle Pulmonary Therapeutics, Inc. Pulmonary aerosol delivery device and method
US6454193B1 (en) * 1999-04-23 2002-09-24 Battellepharma, Inc. High mass transfer electrosprayer
US6790408B2 (en) * 1999-07-17 2004-09-14 Reckitt Benckiser (Uk) Limited Fragrance emitting device
US6311903B1 (en) * 1999-08-18 2001-11-06 The Procter & Gamble Company Hand-held electrostatic sprayer apparatus
US6682004B2 (en) * 1999-08-18 2004-01-27 The Procter & Gamble Company Electrostatic spray device
US6753521B1 (en) * 2000-02-18 2004-06-22 Bruker Daltonics, Inc. Method and apparatus for a nanoelectrosprayer for use in mass spectrometry
US20030173219A1 (en) * 2000-04-03 2003-09-18 Davies Lee Adrian Devices and formulations
US20020022040A1 (en) * 2000-07-10 2002-02-21 The Proctor & Gamble Company Methods of enhancing delivery of oil-soluble skin care actives
US6684897B2 (en) * 2001-03-08 2004-02-03 Worldwide Oilfield Machine, Inc. Valve actuator and method
US6814315B2 (en) * 2001-08-30 2004-11-09 Nordson Corporation Liquid dispensing manifold with adjustable slide plate
US6789741B2 (en) * 2002-03-27 2004-09-14 S. C. Johnson & Son, Inc. Method and apparatus for atomizing liquids having minimal droplet size
US6832794B2 (en) * 2002-08-16 2004-12-21 The Dial Corporation Methods and apparatus for a dual-outlet vapor dispenser
US6729552B1 (en) * 2003-04-22 2004-05-04 E. I. Du Pont De Nemours And Company Liquid dispersion device
US7503512B2 (en) * 2003-06-04 2009-03-17 Matsushita Electric Works, Ltd. Electrostatic atomizer and air purifier using the same

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8442390B2 (en) * 2007-08-29 2013-05-14 Philip Morris Usa Inc. Pulsed aerosol generation
US20090194607A1 (en) * 2007-08-29 2009-08-06 Philip Morris Usa Inc. Pulsed aerosol generation
US20090088700A1 (en) * 2007-09-27 2009-04-02 Olympus Corporation Apparatus and method for liquid spray administration
US20100288860A1 (en) * 2008-01-22 2010-11-18 Yume Inokuchi Electrostatic sprayer
US8991722B2 (en) * 2009-05-11 2015-03-31 Monash University Microfluidic apparatus for the atomisation of a liquid
US20120187209A1 (en) * 2009-05-11 2012-07-26 Monash University Microfluidic apparatus for the atomisation of a liquid
US20100294852A1 (en) * 2009-05-21 2010-11-25 Banco Michael J Methods of Dispensing Two or More Volatile Materials
WO2011038171A1 (en) * 2009-09-28 2011-03-31 Battelle Memorial Institute Electro-hydrodynamic spray device
US20110309157A1 (en) * 2009-10-09 2011-12-22 Philip Morris Usa Inc. Aerosol generator including multi-component wick
US20170035924A1 (en) * 2009-10-09 2017-02-09 Philip Morris Usa Inc. Aerosol generator including multi-component wick
US10828385B2 (en) * 2009-10-09 2020-11-10 Philip Morris Usa Inc. Aerosol generator including multi-component wick
US9555198B2 (en) * 2009-10-09 2017-01-31 Philip Morris Usa Inc. Aerosol generator including multi-component wick
US9526808B2 (en) 2009-10-13 2016-12-27 Philip Morris Usa Inc. Air freshening device
US20110174304A1 (en) * 2010-01-21 2011-07-21 Triplett Ii Michael D Electrohydrodynamic aerosolization device having a time varying voltage
US11253671B2 (en) 2011-07-27 2022-02-22 Nicoventures Trading Limited Inhaler component
US11039643B2 (en) 2012-07-16 2021-06-22 Nicoventures Trading Limited Electronic vapor provision device
US10368582B2 (en) 2012-07-16 2019-08-06 Nicoventures Holdings Limited Electronic vapor provision device
US11039647B2 (en) 2012-07-16 2021-06-22 Nicoventures Trading Limited Electronic vapor provision device
US9919322B2 (en) 2012-09-24 2018-03-20 Lg Electronics Inc. Capsule and electrostatic atomizing device thereof
EP2897736A4 (en) * 2012-09-24 2016-07-06 Lg Electronics Inc Capsule and electrostatic atomizing device thereof
KR20140039550A (en) * 2012-09-24 2014-04-02 엘지전자 주식회사 Electrostatic atomizing device using a disposable capsule
KR101982777B1 (en) * 2012-09-24 2019-05-27 엘지전자 주식회사 Electrostatic atomizing device using a disposable capsule
US9663932B2 (en) 2012-10-29 2017-05-30 Xela Innovations, Llc Fixture cleaning and deodorizing apparatus and method of use
US9453330B2 (en) 2012-10-29 2016-09-27 Xela Innovations, Llc Fixture cleaning and deodorizing apparatus and method of use
WO2014145372A1 (en) * 2013-03-15 2014-09-18 San Jamar, Inc. Apparatus for metered dose of odor control substance
US8889082B2 (en) 2013-03-15 2014-11-18 San Jamar, Inc. Apparatus for metered dose of odor control substance
US10495323B2 (en) * 2014-04-22 2019-12-03 Lg Electronics Inc. Air conditioner and operating method thereof
US11083856B2 (en) 2014-12-11 2021-08-10 Nicoventures Trading Limited Aerosol provision systems
US10888121B2 (en) * 2014-12-15 2021-01-12 Philip Morris Products S.A. E-liquid collapsible cartridge
US20180035717A1 (en) * 2014-12-15 2018-02-08 Philip Morris Products S.A. E-liquid collapsible cartridge
US11744964B2 (en) 2016-04-27 2023-09-05 Nicoventures Trading Limited Electronic aerosol provision system and vaporizer therefor
US11697890B2 (en) 2017-11-21 2023-07-11 Kao Corporation Electrospinning apparatus and systems and methods thereof
US20190153623A1 (en) * 2017-11-21 2019-05-23 Kao Corporation Electrospinning apparatus and systems and methods thereof
US10851475B2 (en) * 2017-11-21 2020-12-01 Kao Corporation Electrospinning apparatus and systems and methods thereof
WO2019105812A1 (en) * 2017-11-30 2019-06-06 Philip Morris Products S.A. Systems for generating a liquid aerosol
US11523636B2 (en) 2017-11-30 2022-12-13 Altria Client Services Llc Systems for generating a liquid aerosol
US11369710B2 (en) 2019-05-16 2022-06-28 Dispensing Dynamics International, Inc. Fragrance dispensers and methods
US11857704B2 (en) 2019-05-16 2024-01-02 Dispensing Dynamics International, Inc. Fragrance dispensers and methods
WO2021028217A1 (en) * 2019-08-14 2021-02-18 Philip Morris Products S.A. An aerosol-generating device and a method of generating a mixed aerosol
US11089915B2 (en) 2019-10-25 2021-08-17 Xela Innovations, Llc Dispenser for use with refill cartridge
USD936195S1 (en) 2019-10-25 2021-11-16 Xela Innovations, Llc Dispenser
USD959626S1 (en) 2019-10-25 2022-08-02 Xela Innovations, Llc Dispenser
US11793365B2 (en) 2019-10-25 2023-10-24 Xela Innovations, Llc Dispenser for use with refill cartridge

Also Published As

Publication number Publication date
CN101137446A (en) 2008-03-05
US8141795B2 (en) 2012-03-27
WO2006086655A1 (en) 2006-08-17
JP2008544834A (en) 2008-12-11
US7798420B2 (en) 2010-09-21
CA2597321A1 (en) 2006-08-17
MX2007009668A (en) 2007-09-26
US20100314460A1 (en) 2010-12-16
EP1848542A1 (en) 2007-10-31
CN101137446B (en) 2010-06-09

Similar Documents

Publication Publication Date Title
US7798420B2 (en) Aerosol dispensing device and method
US7337993B2 (en) Electrostatic atomisation device
US20060261179A1 (en) Aroma dispensing device
US5382410A (en) Electrostatic vapor/aerosol generator with method and apparatus for conditioning building spaces
EP1964614B1 (en) Electrostatic atomizer and food preserving cabinet with electrostatic atomizer
CA2663842C (en) Delivery system for generating liquid active materials using an ultrasonic transducer
EP2895208B1 (en) Ink jet delivery system comprising an improved perfume mixture
GB2432316A (en) Heated wick assemblies
US20100078497A1 (en) Method of Dispensing a Volatile Material
US20170333589A1 (en) Methods for Dispensing Fluid Materials
EP3458114B1 (en) Systems for dispensing fluid materials

Legal Events

Date Code Title Description
AS Assignment

Owner name: BATTELLE MEMORIAL INSTITUTE, OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LIND, JAMES J.;PIATT, BEVERLY A.;DVORSKY, JAMES E.;AND OTHERS;REEL/FRAME:017557/0434

Effective date: 20060210

CC Certificate of correction
AS Assignment

Owner name: EFILED INNOVATIONS, LLC, OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BATTELLE MEMORIAL INSTITUTE;REEL/FRAME:029666/0544

Effective date: 20121107

AS Assignment

Owner name: EFIELD INNOVATIONS, LLC, OHIO

Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE NAME OF THE ASSIGNEE FROM EFILED INNOVATIONS, LLC TO EFIELD INNOVATIONS, LLC PREVIOUSLY RECORDED ON REEL 029666 FRAME 0544. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT;ASSIGNOR:BATTELLE MEMORIAL INSTITUTE;REEL/FRAME:029684/0831

Effective date: 20121107

REMI Maintenance fee reminder mailed
FPAY Fee payment

Year of fee payment: 4

SULP Surcharge for late payment
FEPP Fee payment procedure

Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.)

LAPS Lapse for failure to pay maintenance fees

Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20180921